An experimental investigation is performed to study the effect of jet to plate spacing and low Reynolds number on the local heat transfer distribution to normally impinging submerged circular air jet on a smooth and flat surface. A single jet from a straight circular nozzle of length to diameter ratio(l/d) of 83 is tested. Reynolds number based on nozzle exit condition is varied between 500 and 8,000 and jet to plate spacing between 0.5 and 8 nozzle diameter. The local het transfer characteristics are obtained using thermal images from infrared thermal imaging technique. It was observed that at lower Reynolds numbers, the effect of jet to plate distances covered during the study on the stagnation point Nusselt numbers is minimal. At all jet to plate distances, the stagnation point Nusselt numbers decrease monotonically with the maximum occurring at a z/d of 0.5 as opposed to the stagnation point Nusselt numbers at high Reynolds numbers which occur around a z/d of 6.

ABSTRACT
 기호설명
 1. 서론
 2. 실험 장치와 방법
 3. 실험 데이터 정리
 4. 실험 결과 및 고찰
  4.1 정체점 누셀트수
  4.2 평균 누셀트수
  4.3 반경 방향의 누셀트수
  4.4 레이놀드수와 누셀트수의 관계
 5. 결론
 후기
 References

• 김은영(Dept. of Mechanical Engineering Incheon National University) | Eun-Young Kim Corresponding Author